refactor(metrics/histogram): 🎂 constructor accepts `IntoIterator` #864

Job	Run time
Check	1m 36s
Check rustdoc intra-doc links	18s
Cross compile (armv7-unknown-linux-gnueabihf)	9s
Clippy	1m 7s
Rustfmt	12s
Cross compile (powerpc-unknown-linux-gnu)	17s
Test Suite	1m 50s
Cross compile (powerpc64-unknown-linux-gnu)	10s
Cross compile (wasm32-unknown-unknown)	14s
	5m 53s

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